公开(公告)号：US20210247343A1

公开(公告)日：2021-08-12

申请号：US17264412

申请日：2020-03-13

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Shaoyi XU ,  Zhencai ZHU ,  Wei LI ,  Yanjing SUN ,  Fangfang XING ,  Hongyu XUE ,  Qiang PENG ,  Feng DONG ,  Guang CHEN

IPC: G01N27/12 ,  G01N21/41 ,  G01N33/24 ,  E21C39/00

Abstract: When the heading machine tunnels, a current generated by a current excitation source enters a coal seam through a movable cutting pick to form a stray current. The stray current collected by a backflow net returns to a negative electrode of a power supply through a transition resistor. When information such as the water content of the coal seam changes, the stray current and a potential difference across the transition resistor also accordingly change, and the coal seam water content information is converted into an electric signal. When the potential difference across the transition resistor is applied to two ends of a piezoelectric ceramic, the piezoelectric ceramic extends or compresses, and the electric signal is converted into a strain signal. A sensing optical fiber converts the strain signal into an optical signal detectable by a photoelectric detector. The optical signal is analyzed to obtain the coal seam water content information.

公开(公告)号：US20220144554A1

公开(公告)日：2022-05-12

申请号：US17422756

申请日：2020-04-21

Applicant: China University of Mining and Technology

Inventor： Shaoyi XU ,  Zhencai ZHU ,  Wei LI ,  Yuqiao WANG ,  Fangfang XING ,  Hongyu XUE ,  Qiang PENG ,  Feng DONG ,  Guang CHEN

IPC: B65G19/22 ,  B65G43/00 ,  G01B11/27

Abstract: Disclosed is a device and method for distributed detection of straightness of a working face of a scraper conveyor based on optical fiber sensing. The device includes a broadband light source, a first optical fiber circulator array, a second optical fiber circulator array, a collimator array, a reflecting film array, a third optical fiber circulator array, and an optical path analyzer. During transmission of light emitted from the broadband light source, the light with different wavelengths is separated via several optical gratings etched on a single-mode optical fiber (SMF), and reaches reflecting films adhered to the working face of the scraper conveyor through first optical fiber circulators, second optical fiber circulators, and collimators. The light with the different wavelengths is then reflected back from the reflecting films, enters the SMF through third optical fiber circulators, and finally enters the optical path analyzer.